1. M. J. M., Bless, J., Bouckaert, P. H., Bouzet, R., Conil, P., Cornet, M., Fairon-Demaret, E., Groessens, P. J., Longerstaey, J. P. M. T. H., Meesen, E., Paproth, H., Pirlet, M., Streel, H. W. J., Van Ameron and M., Wolf: Dinantian rocks in the subsurface North of the Brabant and Ardenno-Rhenish massifs in Belgium, the Netherlands and the Federal Republic of Germany, Mededelingen Rijks Geologische Dienst Nieuwe Serie, 27, 3-1976.
2. J. A. D., Dickson, T. D., Ford and A., Swift: The stratigraphy of the Carboniferous rocks around Castletown, Isle of Man, Proc. Yorks. Geol. Soc., 46, 203-229, 1987.
3. W. H., Hass: Conodonts of the Barnett Formation of Texas, U.S. Geol. Surv. Prof. Pap, 243-F, 69-94, 1953.
4. I., Metcalfe: Conodont faunas and age of the Raygill Quarry Limestones (Embsay Limestone), Lothersdale, Yorkshire, Proc. Yorks. Geol. Soc, 43, 169-178, 1980.
5. I., Metcalfe: Conodont zonation and correlation of the Dinantian and early Namurian strata of the Craven Lowlands of northern England, Inst. Geol. Sco. Rept, 80/10, 1-70, 1981.